Pembrokeshire, United Kingdom

Canker_ pretty sure this is what my poor damson tree has,and it may explain why its never done much.Its only about seven years old. (weeping splits in the bark in several places) Please can someone tell me whether I need to dig out the whole root run before replanting, and if I put another tree there, eg a crab perhaps, would that be in danger of being infected?
So frustrating as its underplanted with naturalised crocus and cyclamen, so will have to wait a while before removing the tree.

• 11 Feb, 2016